Information disclosure in Guacamole - CVE-2021-41767

Vulnerability identifier: #VU59552

CSH Severity: Medium

CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-41767

CWE-ID: CWE-200

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to the application includes a private tunnel identifier in the non-private details of some REST responses. A remote user can obtain the private tunnel identifier and use it to interact with another user's active use of that same connection.

Guacamole

Install updates from vendor's website.

Guacamole - update to 1.4.0

• https://lists.apache.org/thread/5l31k4jmzdsfz0xt8osrbl878gb3b7ro
• http://www.openwall.com/lists/oss-security/2022/01/11/6

• Multiple vulnerabilities in Apache Guacamole